Thinly slice the green onions and separate the white bottoms from the green tops.
In a wide-mouth mason jar, whisk together oyster sauce, brown sugar, soy sauce, and sesame oil.
Bring a large pot of water to a boil (don’t salt it). Cook the pasta (only 8 oz not the whole package!) until al dente, then drain and set aside.
While the pasta cooks, melt butter in a large skillet over medium-low heat. Add the white parts of the green onions, garlic, and ginger. Sauté for 2–3 minutes, until soft and fragrant. Don’t let the butter brown.
Remove the skillet from heat. Add the drained pasta and sauce to the pan. Toss well to coat. If the noodles are clumping, add a splash of hot water to loosen them up.
Top with the green onion tops. Add red pepper flakes to individual servings if desired. Serve warm.
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Notes
Note 1: This is the “secret” to great flavor—don’t skip it! You’ll find it in most grocery stores in the Asian section.Note 2: Start small and add more as needed—it’s spicy and each brand is different. Less sauce means less overall flavor, so adjust to your taste.Storage: Best eaten right after making, but leftovers are surprisingly good cold too!